1010120111221 has 4 divisors (see below), whose sum is σ = 1087821658252. Its totient is φ = 932418564192.

The previous prime is 1010120111153. The next prime is 1010120111237. The reversal of 1010120111221 is 1221110210101.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 611233130596 + 398886980625 = 781814^2 + 631575^2 .

It is a cyclic number.

It is not a de Polignac number, because 1010120111221 - 2⁷ = 1010120111093 is a prime.

It is a super-2 number, since 2×1010120111221² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 77701547017 = 1010120111221 / (1 + 0 + 1 + 0 + 1 + 2 + 0 + 1 + 1 + 1 + 2 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1010120111521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38850773496 + ... + 38850773521.

It is an arithmetic number, because the mean of its divisors is an integer number (271955414563).

Almost surely, 2^{1010120111221} is an apocalyptic number.

It is an amenable number.

1010120111221 is a deficient number, since it is larger than the sum of its proper divisors (77701547031).

1010120111221 is an equidigital number, since it uses as much as digits as its factorization.

1010120111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77701547030.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 1010120111221 its reverse (1221110210101), we get a palindrome (2231230321322).

The spelling of 1010120111221 in words is "one trillion, ten billion, one hundred twenty million, one hundred eleven thousand, two hundred twenty-one".